Synthesis of manganese oxidation catalyst

Abstract

Abstract A process is described for the preparation of a manganese complex catalyst having the formula: ##STR1## wherein Mn is manganese in a III or IV oxidation state; X is independently selected from a coordinating or bridging species selected from the group consisting of: H 2 O, O 2 2- , O 2- , OH - , HO 2 - , SH - , S 2- , >SO, Cl - , N 3 - , SCN - , N 3- , RCOO - , NH 2 - and NR 3 ; R is a radical selected from the group consisting of H, alkyl and aryl radicals; L is an organic ligand containing at least two nitrogen atoms that coordinate with the Mn; z is an integer ranging from -4 to +4; Y is a monovalent or multivalent counterion leading to charge neutrality; and q is an integer from 1 to 4; the process comprising the steps of: (i) reacting in an aqueous medium a manganese (II) salt with the ligand L to form a manganese coordinated substance, a counterion salt M z Y q being present wherein M is selected from the group consisting of metals, ammonium and alkanolammonium ions; (ii) oxidizing the manganese coordinated substance of step (i) with an oxidizing agent; (iii) basifying a reaction mixture containing the oxidized manganese coordinated substance formed in step (ii) to a pH of at least 10.5; and (iv) contacting the basified reaction mixture with a further oxidizing agent to form the manganese complex catalyst.

Inventors

• 👤 Judith L. Kerschner
• 👤 Lisa DelPizzo

Bibliographic Details